vanadium 音标拼音: [vən'ediəm]
n . 钒
钒
vanadium n 1 :
a soft silvery white toxic metallic element used in steel alloys ;
it occurs in several complex minerals including carnotite and vanadinite [
synonym : {
vanadium }, {
V }, {
atomic number 23 }]
Vanadium \
Va *
na "
di *
um \,
n . [
NL .,
fr .
Icel .
Vanad [
imac ]
s ,
a surname of the Scandinavian goddess Freya .] (
Chem .)
A rare element of the nitrogen -
phosphorus group ,
found combined ,
in vanadates ,
in certain minerals ,
and reduced as an infusible ,
grayish -
white metallic powder .
It is intermediate between the metals and the non -
metals ,
having both basic and acid properties .
Symbol V (
or Vd ,
rarely ).
Atomic weight 50 .
94 (
C12 =
12 .
000 ).
[
1913 Webster PJC ]
vanadium Symbol :
V Atomic number :
23 Atomic weight :
50 .
9415 Soft and ductile ,
bright white metal .
Good resistance to corrosion by alkalis ,
sulphuric and hydrochloric acid .
It oxidizes readily about 933K .
There are two naturally occurring isotopes of vanadium ,
and 5 radioisotopes ,
V -
49 having the longest half -
life at 337 days .
Vanadium has nuclear applications ,
the foil is used in cladding titanium to steel ,
and vanadium -
gallium tape is used to produce a superconductive magnet .
Originally discovered by Andres Manuel del Rio of Mexico City in 1801 .
His discovery went unheeded ,
however ,
and in 1820 ,
Nils Gabriel Sefstron of Sweden rediscovered it .
Metallic vanadium was isolated by Henry Enfield Roscoe in 1867 .
The name vanadium comes from {
Vanadis },
a goddess of Scandinavian mythology .
Silvery -
white metallic transition element .
Vanadium is essential to {
ascidian }
s .
Rats and chickens are also known to require it .
Metal powder is a fire hazard ,
and vanadium compounds should be considered highly toxic .
May cause lung cancer if inhaled .
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